Blending

Blending is the process of mixing two or more fibres of different physical or aesthetic parameters in a certain ratio which can be reproduced.

CVC Yarn

In a cotton-polyester blended yarn, when the amount of cotton fibreis more than polyester fibre it is called CVC yarn. Here CVC stands for (full form of CVC) Chief Value of Cotton i.e., the ratio of the cotton fibre is always 50% or more.

Example: 30 s/1 Ne (60/40) CVC Yarn means, it is a 30 count single ply cotton-polyester blended yarn where the ratio of cotton fibre to polyester fibre is 60 to 40.

PC Yarn

The type of yarn that is comprised of cotton-polyester fibre blend is called PC yarn, but in general, where the amount of polyester fibre is more than cotton fibre is called PC yarn. Here PC stands for Polyester Cotton.

Example: 30 s/1 (60/40) Ne PC Yarn means, It is a 30 count single ply cotton-polyester blended yarn where the ratio of polyester fibre to cotton fibre is 60 to 40.

It can be said that every CVC yarn is also PC yarn but all the PC yarns are not CVC yarn.

The most popular reason for blending is that of combining the properties of two or more fibers. It is also used to increase aesthetic effects in the fabric.

Polyester/cotton blend is an example; a good end use is in suiting. Polyester is a man-made fiber with high abrasion resistance and cotton is a natural fiber and has good moisture absorbency & feel.

Blending Process Of Cotton-Polyester Fibre

To produce a CVC/PC yarn the fibres must be blended before it reaches to ring frame machine as roving. This process mainly can be done in two manners.

Fibre Blending

According to the blending ratio of cotton & polyester fibre in the yarn, numbers of cotton & polyester bales are given in the lay down in blow room using bale management.

Then the both fibres pass consecutively through the fibre plucker machine- mostly used – Uniflock (Rieter) or Blendomat (Trutzschler) machine and then gradually different cleaning machines.

The homogenous blend of fibres takes place at mixing machine- mostly used as- Unimix (Rieter) or Multimixer (Trutzschler) machine. This type of mixing/blending is called fibre blending.

From this type, blended card slivers can be obtained. Then the regular spinning flow chart is followed till ring frame machine to produce PC/CVC blended yarn.

Sliver Blending

In this process, cotton fibres & polyester fibres are processed through separate machines from blow room to carding. Then the separate card slivers are made from polyester & cotton.

After that, the polyester carded slivers are passed through one phase draw frame which is known as a pre-pass phase to keep the sliver Hank as optimum as possible.

After that, according to the required blended ratio, the slivers are blended in breaker draw frame. In draw frame slivers are doubled, drafted & blended to the required ratio. After that,

In draw frame slivers are doubled, drafted & blended to the required ratio. After that, the conventional spinning process is followed till ring frame machine to produce PC/CVC yarn.

After a lot of experiments, it has been noticed that sliver blending is slightly better than fibre blending. In sliver blending the ratio of cotton & polyester can be maintained more precisely than fibre blending.